Family members can cancel bank cards on their behalf. However, if the cardholder cannot reach the bank for reasonable reasons and has to entrust others, he can entrust his family or others to cancel the bank card and need to issue a power of attorney. When handling, the trustee shall carry the identity documents of the entrusting party and the trustee, the bank card to be cancelled and the power of attorney. Generally speaking, if you want to cancel your bank card, you can only do it yourself.